If this is a habit he is comfortable with, you might have a difficult time
dissuading him from it in just three days time. Does he recognize that his
mental math is sometimes faulty? Does it bother him that the answers don't
receive credit because of the errors? If so, that would be a good argument
to use. On the other hand, he might not care that the answer is marked wrong
as long as he is intrinsically motivated. He might feel that he knows the
procedure, and not care so much about the final answer. In that case, three
days isn't adequate time to change his mind or convince him. Does the test's
outcome determine something that he will miss out on without a passing score?
:-)
-Gail, for the Teacher2Teacher service